A Stable Amine-Functionalized Microporous Metal-Organic Framework for Thermodynamically and Kinetically Selective Gas Separations
A Stable Amine-Functionalized Microporous Metal-Organic Framework for Thermodynamically and Kinetically Selective Gas Separations
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用于热力学和动力学选择性气体分离的稳定胺官能化微孔金属有机框架
DOI：
10.1002/slct.201900416
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发表时间：
2019
期刊：
影响因子：
2.1
通讯作者：
Lin Yichao
中科院分区：
文献类型：
--
作者：
Tian Yuanyuan;Mu Bin;Li Bo;Li Xing;Xu Wei;Lin Yichao
报道了一种胺功能化的微孔金属有机框架（MOF），能够从烟气/天然气中热力学捕获二氧化碳并从异丁烷中动力学分离正丁烷。该化合物 Co2(abim)(im)3(abim=2-氨基苯并咪唑，im=咪唑) 具有良好的热稳定性和化学稳定性。根据我们的计算模型，它具有尖锐的孔径分布，孔径为∼4.9 Å。为这种新化合物提出了两个功能：基于单组分测量和二元气体混合物突破性实验证明的热力学机制，碱性胺基团比 N2 和 CH4 对酸性 CO2 分子具有更高的亲和力；孔径对于正丁烷和异丁烷的动力学分离是最佳的，其动力学直径分别为4.3和5.0 Å，这从压力衰减测量和突破性实验中得到证实。新型 MOF 有望同时应对工业实践中二氧化碳捕集和正丁烷与异丁烷分离的挑战。
An amine‐functionalized microporous metal‐organic framework (MOF)capable of thermodynamically capturing CO2from flue gas/natural gas and kinetically separating n‐butane from iso‐butane is reported. The compound, Co2(abim)(im)3(abim=2‐aminobenzimidazole, im=imidazole) is both thermally and chemically robust. According to our computational modeling, it has a sharp pore size distribution with a pore diameter of ∼4.9 Å. Two functionalities are proposed for this new compound: the basic amine groups provide higher affinity to acidic CO2molecules than N2and CH4based on a thermodynamic mechanism which is demonstrated by the single component measurements and binary gas mixture breakthrough experiments; the pore aperture is optimal for the kinetic separation of n‐butane and iso‐butane which have kinetic diameters of 4.3 and 5.0 Å, respectively, which is confirmed from the pressure decay measurements and the breakthrough experiment. The new MOF is promising to simultaneously confront the challenges in both CO2capture and the separation of n‐butane from iso‐butane in industrial practice.